package com.lkd.utils;

import org.apache.commons.lang.StringUtils;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class HttpUtils {
   
   /**
    * get
    * 
    * @param host
    * @param path
    * @param method
    * @param headers
    * @param querys
    * @return
    * @throws Exception
    */
   public static HttpResponse doGet(String host, String path, String method, 
         Map<String, String> headers, 
         Map<String, String> querys)
            throws Exception {     
       HttpClient httpClient = wrapClient(host);

       HttpGet request = new HttpGet(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
           request.addHeader(e.getKey(), e.getValue());
        }
        
        return httpClient.execute(request);
    }
   
   /**
    * post form
    * 
    * @param host
    * @param path
    * @param method
    * @param headers
    * @param querys
    * @param bodys
    * @return
    * @throws Exception
    */
   public static HttpResponse doPost(String host, String path, String method, 
         Map<String, String> headers, 
         Map<String, String> querys, 
         Map<String, String> bodys)
            throws Exception {     
       HttpClient httpClient = wrapClient(host);

       HttpPost request = new HttpPost(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
           request.addHeader(e.getKey(), e.getValue());
        }

        if (bodys != null) {
            List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>();

            for (String key : bodys.keySet()) {
                nameValuePairList.add(new BasicNameValuePair(key, bodys.get(key)));
            }
            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(nameValuePairList, "utf-8");
            formEntity.setContentType("application/x-www-form-urlencoded; charset=UTF-8");
            request.setEntity(formEntity);
        }

        return httpClient.execute(request);
    }  
   
   /**
    * Post String
    * 
    * @param host
    * @param path
    * @param method
    * @param headers
    * @param querys
    * @param body
    * @return
    * @throws Exception
    */
   public static HttpResponse doPost(String host, String path, String method, 
         Map<String, String> headers, 
         Map<String, String> querys, 
         String body)
            throws Exception {     
       HttpClient httpClient = wrapClient(host);

       HttpPost request = new HttpPost(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
           request.addHeader(e.getKey(), e.getValue());
        }

        if (StringUtils.isNotBlank(body)) {
           request.setEntity(new StringEntity(body, "utf-8"));
        }

        return httpClient.execute(request);
    }
   
   /**
    * Post stream
    * 
    * @param host
    * @param path
    * @param method
    * @param headers
    * @param querys
    * @param body
    * @return
    * @throws Exception
    */
   public static HttpResponse doPost(String host, String path, String method, 
         Map<String, String> headers, 
         Map<String, String> querys, 
         byte[] body)
            throws Exception {     
       HttpClient httpClient = wrapClient(host);

       HttpPost request = new HttpPost(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
           request.addHeader(e.getKey(), e.getValue());
        }

        if (body != null) {
           request.setEntity(new ByteArrayEntity(body));
        }

        return httpClient.execute(request);
    }
   
   /**
    * Put String
    * @param host
    * @param path
    * @param method
    * @param headers
    * @param querys
    * @param body
    * @return
    * @throws Exception
    */
   public static HttpResponse doPut(String host, String path, String method, 
         Map<String, String> headers, 
         Map<String, String> querys, 
         String body)
            throws Exception {     
       HttpClient httpClient = wrapClient(host);

       HttpPut request = new HttpPut(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
           request.addHeader(e.getKey(), e.getValue());
        }

        if (StringUtils.isNotBlank(body)) {
           request.setEntity(new StringEntity(body, "utf-8"));
        }

        return httpClient.execute(request);
    }
   
   /**
    * Put stream
    * @param host
    * @param path
    * @param method
    * @param headers
    * @param querys
    * @param body
    * @return
    * @throws Exception
    */
   public static HttpResponse doPut(String host, String path, String method, 
         Map<String, String> headers, 
         Map<String, String> querys, 
         byte[] body)
            throws Exception {     
       HttpClient httpClient = wrapClient(host);

       HttpPut request = new HttpPut(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
           request.addHeader(e.getKey(), e.getValue());
        }

        if (body != null) {
           request.setEntity(new ByteArrayEntity(body));
        }

        return httpClient.execute(request);
    }
   
   /**
    * Delete
    *  
    * @param host
    * @param path
    * @param method
    * @param headers
    * @param querys
    * @return
    * @throws Exception
    */
   public static HttpResponse doDelete(String host, String path, String method, 
         Map<String, String> headers, 
         Map<String, String> querys)
            throws Exception {     
       HttpClient httpClient = wrapClient(host);

       HttpDelete request = new HttpDelete(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
           request.addHeader(e.getKey(), e.getValue());
        }
        
        return httpClient.execute(request);
    }
   
   private static String buildUrl(String host, String path, Map<String, String> querys) throws UnsupportedEncodingException {
       StringBuilder sbUrl = new StringBuilder();
       sbUrl.append(host);
       if (!StringUtils.isBlank(path)) {
          sbUrl.append(path);
        }
       if (null != querys) {
          StringBuilder sbQuery = new StringBuilder();
           for (Map.Entry<String, String> query : querys.entrySet()) {
              if (0 < sbQuery.length()) {
                 sbQuery.append("&");
              }
              if (StringUtils.isBlank(query.getKey()) && !StringUtils.isBlank(query.getValue())) {
                 sbQuery.append(query.getValue());
                }
              if (!StringUtils.isBlank(query.getKey())) {
                 sbQuery.append(query.getKey());
                 if (!StringUtils.isBlank(query.getValue())) {
                    sbQuery.append("=");
                    sbQuery.append(URLEncoder.encode(query.getValue(), "utf-8"));
                 }                
                }
           }
           if (0 < sbQuery.length()) {
              sbUrl.append("?").append(sbQuery);
           }
        }
       
       return sbUrl.toString();
    }
   
   private static HttpClient wrapClient(String host) {
      HttpClient httpClient = new DefaultHttpClient();
      if (host.startsWith("https://")) {
         sslClient(httpClient);
      }
      
      return httpClient;
   }
   
   private static void sslClient(HttpClient httpClient) {
        try {
            SSLContext ctx = SSLContext.getInstance("TLS");
            X509TrustManager tm = new X509TrustManager() {
                public X509Certificate[] getAcceptedIssuers() {
                    return null;
                }
                public void checkClientTrusted(X509Certificate[] xcs, String str) {
                   
                }
                public void checkServerTrusted(X509Certificate[] xcs, String str) {
                   
                }
            };
            ctx.init(null, new TrustManager[] { tm }, null);
            SSLSocketFactory ssf = new SSLSocketFactory(ctx);
            ssf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
            ClientConnectionManager ccm = httpClient.getConnectionManager();
            SchemeRegistry registry = ccm.getSchemeRegistry();
            registry.register(new Scheme("https", 443, ssf));
        } catch (KeyManagementException ex) {
            throw new RuntimeException(ex);
        } catch (NoSuchAlgorithmException ex) {
           throw new RuntimeException(ex);
        }
    }
}